Oh, the mental resistance thing isn't complete resistance to mentally based gifts, it's as you said, the ability to keep his mind empty when near telepathically gifted people, though I suppose I could have worded it better myself. Also, as for the ghost thing, instead of six hours a day, how about he can maintain his gift in short bursts, like a keeping the gift up a minute, then he needs 10 minutes of rest in order to be able to use it again, would that work?